Human influences on the environment

Question 1

The discharge of organic manure into a stream affects the abundance of various organisms living in the water. The graph below shows the changes in the populations of stonefly nymphs, algae, and bacteria before and after a manure discharge point. Stonefly nymphs are aquatic insects that are highly sensitive to dissolved oxygen levels.

Line graph showing the population densities of three organisms along a stream before and after a manure discharge point.

Explain the changes in the populations of stonefly nymphs and algae from the point at which the manure enters the stream.

[6]

Human influences on the environment

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Question 1

The discharge of organic manure into a stream affects the abundance of various organisms living in the water. The graph below shows the changes in the populations of stonefly nymphs, algae, and bacteria before and after a manure discharge point. Stonefly nymphs are aquatic insects that are highly sensitive to dissolved oxygen levels.

Line graph showing the population densities of three organisms along a stream before and after a manure discharge point.

Explain the changes in the populations of stonefly nymphs and algae from the point at which the manure enters the stream.

[6]

Human influences on the environment

Question 1

Human influences on the environment Questions

Human influences on the environment

Question 1

Human influences on the environment Questions